Crochet Tension 5 treble and 3 rows to 2.5cm on pattern using 4.5mm hook

Measurements
To fit chest
16, 18, 20 inch (41, 46, 51 cm)
Length from back neck
10, 11, 12 inch (25, 28, 31 cm)
Sleeve seam
5, 5½, 6 inch (13, 14, 15 cm)

Each source has a different set of recommended yarns. The following are from the Maryland pamphlet.

Materials
MARYLAND 4 PLY KNITTINGS
Fingering Pure New Wool, Pure Nylon, Superwash (machine washable)
5, 6, 7 balls
3 press fasteners
Ribbon for yoke and sleeves
Stitch holders.